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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 09, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Jul. 10, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Weighted average grant date fair value of options granted   $ 4.59   $ 4.81                          
Total fair value of options vested   $ 59   $ 99                          
Total unrecognized compensation expense   $ 2,721   $ 2,721                          
Total unrecognized compensation expense, weighted-average period of recognition       2 years 10 months 24 days                          
Dividends   0.00%   0.00%                          
Common stock, shares authorized   150,000,000   150,000,000                       150,000,000 150,000,000
Stock-based compensation expense   $ 1,430 $ 41 $ 3,750 $ 88                        
2020 Employee Stock Purchase Plan                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Common stock reserved for issuance   316   316                          
Percentage of outstanding shares of common stock       1.00%                          
Exercise price of option on fair value (as a percent)       85.00%                          
Common stock, shares authorized   340   340                          
Shares of common stock have been issued to employees       24                          
ISOs and NSOs | Minimum                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Vesting period       1 year                          
ISOs and NSOs | Minimum | Share-based Payment Arrangement, Tranche One                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Exercise price of option on fair value (as a percent)       100.00%                          
ISOs and NSOs | Maximum                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Term of contract       10 years                          
Vesting period       4 years                          
ISOs and NSOs | Maximum | Share-based Payment Arrangement, Tranche One                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Term of contract       10 years                          
Incentive Stock Options | Share-based Payment Arrangement, Tranche Two                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Award vesting percentage       10.00%                          
Incentive Stock Options | Minimum | Share-based Payment Arrangement, Tranche Two                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Exercise price of option on fair value (as a percent)       110.00%                          
Incentive Stock Options | Maximum | Share-based Payment Arrangement, Tranche Two                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Term of contract       5 years                          
Restricted Stock Awards                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Total unrecognized compensation expense, weighted-average period of recognition       1 year 3 months 18 days                          
Total fair value of restricted stock awards vested   $ 1,372   $ 4,947                          
Total unrecognized compensation expense   $ 9,850   $ 9,850                          
Restricted Stock Awards | Forecast                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of restricted stock awards are expected to vest           75 180 136 237 113 113 140 338 120 121    
2020 Incentive Award Plan                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Common stock reserved for issuance 3,333 3,880   3,880                          
Percentage of outstanding shares of common stock 5.00%                                
PDL Equity Incentive Plan                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Total fair value of restricted stock awards vested       $ 0 65                        
PDL Equity Incentive Plan | PDL Award                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Stock-based compensation expense   $ 0 $ 0 $ 0 $ 38